US20110183835A1 - Adsorber element and method for producing an adsorber element - Google Patents

Adsorber element and method for producing an adsorber element Download PDF

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US20110183835A1
US20110183835A1 US12/998,319 US99831909A US2011183835A1 US 20110183835 A1 US20110183835 A1 US 20110183835A1 US 99831909 A US99831909 A US 99831909A US 2011183835 A1 US2011183835 A1 US 2011183835A1
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adsorber
fibers
element according
adsorber element
layer
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Juergen Sauer
Belal Dawoud
Stefanie Chmielewski
Hendrik Van Heyden
Heike Klaschinsky
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Viessmann Werke GmbH and Co KG
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Viessmann Werke GmbH and Co KG
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Assigned to VIESSMANN WERKE GMBH & CO. KG reassignment VIESSMANN WERKE GMBH & CO. KG ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: VAN HEYDEN, HENDRIK, CHMIELEWSKI, STEFANIE, DAWOUD, BELAL, KLASCHINSKY, HEIKE, SAUER, JUERGEN
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
    • B01J20/28—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties
    • B01J20/28014—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties characterised by their form
    • B01J20/2803—Sorbents comprising a binder, e.g. for forming aggregated, agglomerated or granulated products
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
    • B01J20/02—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
    • B01J20/02—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material
    • B01J20/0203—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising compounds of metals not provided for in B01J20/04
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
    • B01J20/02—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material
    • B01J20/06—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising oxides or hydroxides of metals not provided for in group B01J20/04
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
    • B01J20/02—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material
    • B01J20/10—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising silica or silicate
    • B01J20/103—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising silica or silicate comprising silica
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
    • B01J20/02—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material
    • B01J20/20—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising free carbon; comprising carbon obtained by carbonising processes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
    • B01J20/02—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material
    • B01J20/20—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising free carbon; comprising carbon obtained by carbonising processes
    • B01J20/205—Carbon nanostructures, e.g. nanotubes, nanohorns, nanocones, nanoballs
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
    • B01J20/28—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties
    • B01J20/28014—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties characterised by their form
    • B01J20/28023—Fibres or filaments
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
    • B01J20/30—Processes for preparing, regenerating, or reactivating
    • B01J20/32—Impregnating or coating ; Solid sorbent compositions obtained from processes involving impregnating or coating
    • B01J20/3202—Impregnating or coating ; Solid sorbent compositions obtained from processes involving impregnating or coating characterised by the carrier, support or substrate used for impregnation or coating
    • B01J20/3204—Inorganic carriers, supports or substrates
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
    • B01J20/30—Processes for preparing, regenerating, or reactivating
    • B01J20/32—Impregnating or coating ; Solid sorbent compositions obtained from processes involving impregnating or coating
    • B01J20/3214—Impregnating or coating ; Solid sorbent compositions obtained from processes involving impregnating or coating characterised by the method for obtaining this coating or impregnating
    • B01J20/3223—Impregnating or coating ; Solid sorbent compositions obtained from processes involving impregnating or coating characterised by the method for obtaining this coating or impregnating by means of an adhesive agent
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
    • B01J20/30—Processes for preparing, regenerating, or reactivating
    • B01J20/32—Impregnating or coating ; Solid sorbent compositions obtained from processes involving impregnating or coating
    • B01J20/3231—Impregnating or coating ; Solid sorbent compositions obtained from processes involving impregnating or coating characterised by the coating or impregnating layer
    • B01J20/3234—Inorganic material layers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
    • B01J20/30—Processes for preparing, regenerating, or reactivating
    • B01J20/32—Impregnating or coating ; Solid sorbent compositions obtained from processes involving impregnating or coating
    • B01J20/3231—Impregnating or coating ; Solid sorbent compositions obtained from processes involving impregnating or coating characterised by the coating or impregnating layer
    • B01J20/3234—Inorganic material layers
    • B01J20/3236—Inorganic material layers containing metal, other than zeolites, e.g. oxides, hydroxides, sulphides or salts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
    • B01J20/30—Processes for preparing, regenerating, or reactivating
    • B01J20/32—Impregnating or coating ; Solid sorbent compositions obtained from processes involving impregnating or coating
    • B01J20/3231—Impregnating or coating ; Solid sorbent compositions obtained from processes involving impregnating or coating characterised by the coating or impregnating layer
    • B01J20/3234—Inorganic material layers
    • B01J20/3238—Inorganic material layers containing any type of zeolite
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
    • B01J20/30—Processes for preparing, regenerating, or reactivating
    • B01J20/32—Impregnating or coating ; Solid sorbent compositions obtained from processes involving impregnating or coating
    • B01J20/3231—Impregnating or coating ; Solid sorbent compositions obtained from processes involving impregnating or coating characterised by the coating or impregnating layer
    • B01J20/3234—Inorganic material layers
    • B01J20/324—Inorganic material layers containing free carbon, e.g. activated carbon
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B17/00—Sorption machines, plants or systems, operating intermittently, e.g. absorption or adsorption type
    • F25B17/08—Sorption machines, plants or systems, operating intermittently, e.g. absorption or adsorption type the absorbent or adsorbent being a solid, e.g. salt

Definitions

  • the invention relates to an adsorber element according to the preamble of Patent Claim 1 and method for manufacturing an adsorber element according to the preamble of Patent Claim 15 .
  • An adsorber element of the type defined in the introduction is used, for example, in heat pumps on a so-called adsorbent basis (for example, silica gel, activated carbon or zeolite [then called molecular sieve basis]).
  • adsorbent basis for example, silica gel, activated carbon or zeolite [then called molecular sieve basis]
  • Such adsorbents are usually characterized in that they take up refrigerants (water, for example) in a reversible reaction and release them again on exposure to heat. This is due to the pronounced pore structure of this class of materials, which also includes zeolites. Heat is released in absorption of the refrigerant, and conversely, heat is needed to release the refrigerant.
  • the heat effect in the respective reaction whether refrigerant adsorption (the adsorbent releases heat) or refrigerant desorption (the adsorbent takes up heat) can be utilized in heat pumps, as mentioned above.
  • refrigerant adsorption the adsorbent releases heat
  • refrigerant desorption the adsorbent takes up heat
  • the adsorbent must be accessible to the refrigerant molecules, in other words, its pore structure must not be clogged or even blocked.
  • Adsorbents are usually crystalline solids whose particle size is usually in the range of a few micrometers. Good binding of these adsorbent particles to a material such as aluminum or copper having a very good thermal conductivity is advantageous for their use in a heat pump. Since adsorbent particles do not usually adhere to metal, it is necessary to use adhesion promoters (binder materials) which glue the particles to one another and to the metal. These adhesion promoters must meet two criteria. They should not hinder the adsorption of refrigerant into the adsorbent and in general they should not interfere with the function of the heat pump. They should also be made of environmentally tolerable and economically acceptable materials.
  • the heat pump operates under a pure refrigerant vapor pressure at different temperatures. Increasing the pressure prevailing in the heat pump leads to a loss of power of the heat pump due to the presence of inert gases, which can ultimately lead to complete failure. For this reason, the adsorbent layer should not release any gases during a desired lifetime of 15 years, in other words, in particular the adhesion promoter (binder material) that is used must not release any gases.
  • metal meshes metal wool
  • zeolite suspensions are cast with a binder in metal mesh and dried, whereby the metal mesh can be attached to metal walls of a heat pump, for example.
  • this method is described as being inadequate by the same applicant in DE 44 05 669 A1.
  • the metal mesh with zeolite becomes detached from the metal walls in cyclic stresses.
  • alkalinity of alkali silicates is a problem because many adsorbents, including the family of aluminophosphates, silicoaluminophosphates and silicon-rich zeolites can be mentioned, are attacked and/or dissolved by alkaline substances.
  • adsorbent including the family of aluminophosphates, silicoaluminophosphates and silicon-rich zeolites can be mentioned
  • FAM molecular sieve
  • the carbonate impurities which often occur in these materials are a third problem when using “GunGum” or other alkali silicates as a binder material.
  • the high-temperature type 8 Sauereisen cement from the company SeppZeug GmbH does not contain any alkali silicates but instead contains magnesium oxide, magnesium phosphate and zirconium silicate.
  • this material is used as a binder, shrinkage cracks occur massively. Shrinkage cracks are generally caused by a decline in the volume of the solidifying suspension due to the evaporation of fluid and may often be observed when loamy river banks dry out, for example.
  • the adsorbent layer has a very unstable adhesion to aluminum sheeting and falls off immediately with light vibrations.
  • the performance in other words, in particular the stability of molecular sieve layers, is improved by using glass wool nonwovens, as also described in DE 44 05 669 A1.
  • a glass wool nonwoven is applied directly to the metal and then bonded using the molecular sieve/binder suspension.
  • One disadvantage of this approach is that such a glass wool nonwoven can be used only with readily accessible geometries of the metal body.
  • Organic adhesion promoters have the inherent disadvantage that outgassing can occur due to degradation reactions of the organic substances within the heat pump over long periods of time and can then impair the function of the heat pump. This happens against the background that the layers are exposed to temperatures above 150° C. in cyclic operation of the heat pump, and organic substances tend to decompose at these temperatures.
  • a zeolite layer produced by using organic polymer binders is provided, for example.
  • the disadvantage is that the production method cannot be used with all substrate materials in general and is very complex. Molded bodies to be coated (the substrates) must be placed in reactors and typically kept at high pressures and temperatures over a period of several days. Especially untreated and reactive aluminum, such as that which is very advantageous for this production method, however, is undesirable in heat pumps because it may lead to so-called hydrogen corrosion over a long period of time. In this type of corrosion, water reacts with aluminum, forming aluminum hydroxide and/or aluminum oxide hydroxide and/or aluminum oxide and hydrogen. However, the formation of hydrogen in a heat pump is highly undesirable because this gas increases the operating pressure of the heat pump.
  • the object of the present invention is to improve an adsorber element and/or a method for producing an adsorber element of the type described in the introduction.
  • metal bodies in particular are coated according to the invention by applying a liquid, preferably aqueous suspension, and then performing a drying operation.
  • the suspension contains adsorbent particles, fibers and a colloidal binder in addition to the liquid phase,.
  • Colloids (from the Greek kolla “glue” and eidos “form, appearance”) refer to particles or droplets that are finely distributed in another medium (solid, liquid or gas), the dispersion medium.
  • the individual colloid is typically between one nanometer and ten micrometers in size. Colloids usually exhibit Brownian motion if they are mobile (for example, in a liquid dispersion medium).
  • Both the fibers and the colloidal binder are selected from the class of inorganic, inert or largely inert substances, so there cannot be any chemical reactions and/or outgassing during operation of the heat pump.
  • colloidal silicon oxides or colloidal aluminum oxides/hydroxides are used as colloidal binders for bonding adsorbent particles.
  • Fibers are used to impart elasticity and strength to the layer and to prevent shrinkage cracks because the latter may be formed in particular when drying the suspension.
  • the layer Since the layer is continuously exposed to changes in temperature, stresses occur between the various materials that are present, in other words, metal, adhesion promoters, fibers and adsorbent. These substances have different thermal expansion coefficients and therefore undergo different changes in volume and length when heated, which results in the aforementioned stresses. To achieve permanent strength of the layer, this means that the layer must be elastic within certain limits—it must be able to “breathe.” To obtain a certain relaxation ability of the layer when working with relatively brittle materials such as glass, the corresponding binder material used is preferably used in fiber form.
  • the maximum possible bending of a fiber until breakage depends to a significant extent on the diameter of the fiber.
  • flexible materials that are elastic to a certain extent can also be produced using brittle oxidic materials such as glass, for example, if they are processed as fibers.
  • a drinking water glass is a brittle, fragile object but glass wool has a very high flexibility.
  • a single glass wool fiber can be wound onto a roll, for example, without breaking.
  • especially advantageous fibers of various orders of magnitude may be used. Larger fibers impart stability and elasticity over great distances of the layer, whereas smaller fibers bind the individual adsorbent particles to one another and to the larger fibers and the substrate over small distances (see also FIG. 1 , which illustrates schematically the structure of such a layer).
  • a layer cross-linked by fibers is less susceptible to trouble. For example, if the layer becomes detached from the metal at one location due to strong mechanical stress, it nevertheless remains adhering to the substrate surface as a whole because other locations can still ensure adequate adhesion.
  • the second advantage lies in the thermal conductivity of the layer. In addition to the adhesion and elasticity, this is crucial for successful implementation of the overall concept. If fibers having a good thermal conductivity are used, the thermal conductivity of the entire layer is increased.
  • a colloidal binder is necessary as an adhesive in order to bind fibers, adsorbent particles and the substrate and/or metal surface to one another on a molecular level. It has the advantage in comparison with conventional adhesives that it need not be organic (commercially available adhesives, for example, Uhu, epoxy resin, Pattex, etc., consist of organic substances with the disadvantages mentioned above) nor can it completely or even partially bond the pores of the adsorbent. Complete bonding of the adsorbent pores should be avoided for use in a heat pump because this would prevent the adsorbent from adsorbing or desorbing the refrigerant.
  • One possible disadvantage of the technique presented here for creating a partially elastic layer with the help of fibers is the preferred orientation of fibers that might be created due to directional shearing forces during the application process. Such a preferential orientation may result in the occurrence of shrinkage cracks during the process of drying the suspension.
  • the adsorbent layer can be reinforced mechanically only in the direction of the longitudinal axis of the fibers.
  • a random distribution of the fibers would be preferred. Such a random distribution can be largely achieved by spraying the suspension onto the respective substrate, which leads to weak, irregular shearing forces. Fibers can no longer be oriented directionally in this way.
  • a second method lies in adding a gas-forming substance, which is added to the suspension and is present in the layer in a homogeneous distribution during the process of drying the suspension, leading to a randomly distributed orientation of the fibers due to the formation of gas bubbles. If gas bubbles emerge from the liquid suspension before it dries, they result in an irregular and randomly distributed turbulence in the suspension, so that the fibers that are present are distributed irregularly, as desired. Formation of the gas bubbles additionally leads to loosening of the dried layer, while the cavities and channels that develop facilitate the diffusion of water molecules, but on the other hand they make the transport of heat within the layer difficult.
  • the gas-forming substance is to be selected from the group of reactive or volatile substances, so that after the process of drying the suspension, no more gas, which could influence the function of the heat pump, is formed.
  • Firmly adhering layers can be obtained by thoroughly mixing ground fibers of an average length of approximately 100 micrometers and a diameter of 5-12 micrometers with adsorbent powder and adding a colloidal binder based on aluminum oxide/silicon oxide. The resulting aqueous suspension is mixed again thoroughly and then applied to any substrate. After a drying process, these layers will adhere to different materials with a hydrophilic surface, such as copper, glass, aluminum or porcelain.
  • the resulting oxygen escapes and, during drying, forms pores approximately 50 micrometers in size.
  • Iron(III) chloride is given here as an example of a catalyst that decomposes hydrogen peroxide, but there are a number of other suitable catalysts that may be selected, depending on the specifics. Additional examples that can be mentioned include MnO 2 , colloidal MnO 2 , MnCl 2 , Fe(OH) 2 , Fe(OH) 3 , colloidal Fe(OH) 3 .
  • the use of colloidal forms of certain transition metal oxides/hydroxides may be especially advantageous because they have a high catalytic activity for the decomposition of H 2 O 2 , so they need be added only in very small quantities and because they cannot penetrate into the adsorbent pores, given a sufficient size of the catalyst particles, which could lead to a loss of efficacy.
  • Firmly adhering layers having a further improved thermal conductivity can be obtained as described in point 1 by adding carbon nanotubes (CNTs) in an amount by weight of a few percent and distributing them homogeneously in the suspension. Hydrophilized multiwall CNTs (carbon nanotubes) are preferably used.
  • DE 10 2005 000 022 A1 discloses a sorbent molded body and a method for producing and using same.
  • the powder used and/or the granules used are not in the form of a layer in this approach but instead are in the form of a so-called aggregate material (mix of solid particles mixed loosely together or pressed firmly together or caked) arranged inside a cage.
  • inventive adsorber element as well as the method for producing the inventive adsorber element are explained in greater detail below on the basis of a few examples.
  • adsorbent layers in described in Examples a) through e) adhere firmly to the aluminum sheets used and do not separate from the sheet metal even under thermal load.
  • the coated sheet metal is subjected to repeated thermal shocks. For this purpose, they were placed in an oven at approximately 160° C. and then immediately dipped in a bucket filled with ice water. Then the procedure was repeated up to three times.
  • the layers were brought to 120° C. with the help of a special test setup, and then cooled to 20° C. after 10 minutes. In heating, dry air was passed over the samples, and in cooling, moist air was passed over the samples. After 15,000 cycles of this type, the samples did not have any stability problems.
  • the average layer thickness of the layers thus created was approximately 350 to 450 micrometers.
  • the adsorber content of all the layers produced in the examples, including the comparative examples, was 70% (percent by weight) based on the completely hydrated adsorbent.
  • Example j Comparative example, using FAM molecular sieve from the company Mitsubishi and high-temperature binder Ceramabond 569 from the company Kager Industrietechnik GmbH: The procedure followed was the same as that described in Example h). In contrast with Example i), shrinkage cracks are discernible only with a magnifying glass, but the layer is only insignificantly more stable than that produced in Example i) and it falls off after only slight vibration.

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US12/998,319 2008-10-10 2009-10-02 Adsorber element and method for producing an adsorber element Abandoned US20110183835A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE102008050926A DE102008050926A1 (de) 2008-10-10 2008-10-10 Adsorberelement und Verfahren zur Herstellung eines Adsorberelements
DE102008050926.4 2008-10-10
PCT/DE2009/001370 WO2010040335A2 (fr) 2008-10-10 2009-10-02 Élément adsorbant et procédé pour fabriquer un élément adsorbant

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US (1) US20110183835A1 (fr)
EP (1) EP2337629A2 (fr)
JP (1) JP2012505071A (fr)
KR (1) KR20110069119A (fr)
CN (1) CN102176964A (fr)
DE (1) DE102008050926A1 (fr)
WO (1) WO2010040335A2 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8794373B1 (en) 2013-03-15 2014-08-05 Bose Corporation Three-dimensional air-adsorbing structure
US10689545B2 (en) 2012-07-19 2020-06-23 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Dispersion, method for coating objects with this dispersion, and use of the dispersion

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